I need to do chrome/opera hacks because of a font replacement script wanted by the client that breaks things... this is sad but everything is working in IE6
A clean javascript way to do this: http://rafael.adm.br/css_browser_selector/
It ads browser specific classes to the body tag of your html which you can use in your css like:
.opera #thingie, .chrome #thingie { do: this; }
Hope this helps.